pH - Dissolved Oxygen

pH is a measurement of acidity and alkalinity of a solution. pH is one of the most common analytical measurements used in process control as many chemical reactions rely on the pH of a process being maintained at the correct value. By using accurate pH measurement it is possible to automate and improve the efficiency of a process minimising waste and reducing costs. 

pH instrumentation and sensors used to monitor the effluent from a factory can identify if the effluent requires treatment before it is discharged within the required consent levels. This minimises the effects of the waste on the environment ensuring operators comply with local legislation and laws.

Dissolved Oxygen measurement can be applied to a variety of industries and applications where accurate control is required to improve and optimize processes.  Dissolved Oxygen is a term used for the measurement of the amount of oxygen dissolved in a unit volume of water.

In sewage treatment, where bacteria is used to decompose the solids, it is important to accurately control the Dissolved Oxygen level as when the level is too low, the bacteria die and decomposition stops.
Dissolved Oxygen measurement is also used in fermentation processes in beer and wine production where the measurement and control of oxygen is required to maintain a quality product.

• Moulded Ryton® body with 0.75” or 1” NPT male threaded connection
• Optional built-in solution ground
• Sealed double junction reference
• Wide range of mounting options
• Optional PT1000 or PT100 temperature compensation
• Fluoride resistant bulb option

• The SP100 has a polymer body intended for use in applications up to 80ºC and 4 bar (58 psig). This sensor may be a more economical alternative for low temperature and low pressure industrial applications.

The BXD17 from LTH Electronics is a microprocessor controlled instrument range offering individual controllers for the contacting conductivity, electrodeless (inductive) conductivity, pH / redox (ORP) and dissolved oxygen measurement parameters. To achieve this, the instrument utilises a clear multifunction LCD to display the primary and temperature readings, show operational status and to provide an intuitive user interface while multilingual text displays can be selected from a choice of English, French, Spanish and Italian. 

The instrument has two onboard volt-free normally open-relays with adjustable setpoint value and hysteresis. Either one can be set to activate on a high, low or band operation allowing the instrument to be used in a variety of dosing and control operations. Additional setpoint functions include delayed activation dose alarm timer, proportional and accumulation dosing (electrodeless conductivity only), cleaning cycle. 
Additionally, the instrument features one industry standard, isolated, 0/4-20mA current output enabling the instrument to transmit the primary reading for remote monitoring purposes with features including adjustable scaling, selectable on-error states and loop fault detection. 
Features include adjustable scaling, selectable on-error states and loop fault detection 
Also included are two digital inputs operating on closed or open contact which allows the instrument to be triggered by No Flow, Low Tank Level, Interlock or Off-Line functions that force the relays to deactivate and the current output to a pre-defined state.
Depending upon the version purchased the instrument is powered either by 90-265vAC or 12-30vDC.
The BXD17 has a Micro SD card slot allowing the user to upgrade to the latest software available should the need arise. 

The OxyTechw² RDO Pro-X Sensor uses the latest optical technology for measuring dissolved oxygen (DO) in demanding wastewater, drinking water, industrial effluent and surface water environments.

The sensor uses optical sensing techniques that provide a fast response and do not need a flowing sample to operate. There is no need for routine calibration, enabling manual intervention to be kept to an absolute minimum. Periodic validation of the measurement can be done as part of standard quality assurance performed by the operator. The sensor uses an extended life cap that does not have a finite life, though replacement is recommended every two years. When replacement of the cap is required the operation takes only a few minutes with no need to enter complex set-up codes and no need to re-calibrate.